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Wed, 29 Apr 2026 08:39:53 -0700 (PDT) X-Received: by 2002:a05:7022:eacd:b0:12c:2cf8:2f30 with SMTP id a92af1059eb24-12ddd9614a5mr3768748c88.15.1777477193388; Wed, 29 Apr 2026 08:39:53 -0700 (PDT) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-12de3216e81sm3765626c88.4.2026.04.29.08.39.52 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 29 Apr 2026 08:39:52 -0700 (PDT) Message-ID: <25d267b9-7839-413a-ad91-9c6802bcf292@broadcom.com> Date: Wed, 29 Apr 2026 08:39:51 -0700 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Florian Fainelli Subject: Re: [PATCH v3 00/15] SCMI Clock rates discovery rework To: Cristian Marussi , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, arm-scmi@vger.kernel.org, linux-clk@vger.kernel.org, linux-renesas-soc@vger.kernel.org Cc: sudeep.holla@arm.com, philip.radford@arm.com, james.quinlan@broadcom.com, vincent.guittot@linaro.org, etienne.carriere@foss.st.com, peng.fan@oss.nxp.com, michal.simek@amd.com, geert+renesas@glider.be, kuninori.morimoto.gx@renesas.com, marek.vasut+renesas@gmail.com References: <20260428201522.903875-1-cristian.marussi@arm.com> Content-Language: en-US Autocrypt: addr=florian.fainelli@broadcom.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-DetectorID-Processed: b00c1d49-9d2e-4205-b15f-d015386d3d5e On 4/28/2026 1:15 PM, Cristian Marussi wrote: > Hi, > > it was a known limitation, in the SCMI Clock protocol support, the lack of > dynamic allocation around per-clock rates discovery: fixed size statically > per-clock rates arrays did not scale and was increasingly a waste of memory > (see [1]). > > This series aim at solving this in successive steps: > > - simplify and reduce to the minimum possible the rates data info exposed > to the SCMI driver by scmi_clock_info > - move away from static fixed allocation of per-clock rates arrays in > favour of a completely dynamic runtime allocation: just allocate what > is needed based on the effectively discovered > > This is done in patches 2-6. > > A further bigger optimization suggested in a past series [2] by Etienne > would be, whenever allowed by the spec, to limit upfront the number of > queries in order to simply retrieve min and max rate, that are indeed the > only rates needed by the CLK SCMI driver. > > The approach proposed in [1] was open coding and duplicating some of the > functionalities already provided by SCMI iterators, though. > > Patch 7-14 implement such optimization instead by: > > - reworking core SCMI iterators to support bound enumerations > - use such new bound iterators to perform the minimum number of queries > in order to only retrieve min an max rate > > As a final result now the rates enumeration triggered by the CLK SCMI > driver, while still allocating for all the existent rates, miminize the > number of SCMI CLK_DESCRIBE_RATE messages needed to obtain min and max. > > Finally, patch 15 introduces a new clock protocol operation to be able to > trigger anytime on demand a full enumeration and obtain the full list of > rates when needed, not only min/max: this latter method is really only used > currently by some dowstream SCMI Test driver of mine. > > Most notably in this V3 I had: > > - picked up Geert fixes on V2: these could have been squashed in the > original series while maintaining proper Geert's authorship but as of > now I have simply picked them up and changed their order to be near the > commit they fix > > - dropped the "Harden Clock protocol initialization" patch that caused a > number of out-of-spec vendor FW to break > > Based on v7.1-rc1. > Tested on ARM/JUNO, RADXA/ROCK5B and an emulated environment. Tested-by: Florian Fainelli -- Florian